The water flow from outlets has to be parallel to each other, as in a spraybar flow or at least single type outlets that blow straight, horizontal and parallel to each other towards the front glass. The water then would hit the front glass, slide down to the bottom, sweep the bottom back in the direction of the inlets out the back which would "filter" the water out of particles......and then the circle, i.e. circular flow repeats itself.
In your scenario, the outlet flow crosses paths with each other. early on..I'd use the word ...."splashes" water around......It will not pick up the detritus and bring it to the inlets but instead blow it all around the tank...some will get to the inlets, some will keep floating around for a long time before "accidentally" finding its way to the inlets...so one will have particulates around the tank for longer.....
To fix that, you need to either change the outlets types, lose the pumps/wavemakers(they blow in all directions), etc.....The direction of the flow from each outlet needs to be parallel to each other and horizontal... You can either set up up back to front or side to side...Side to side is more difficult because if the tank is well decorated, the water will lose velocity as it hits the decor, plus the distance is longer...